http://www.k-wave.org/forum/topic/easiest-fastest-way-to-obtain-spatial-derivatives-of-pressure Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:07:56 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/easiest-fastest-way-to-obtain-spatial-derivatives-of-pressure#post-6623 Tue, 30 Oct 2018 16:35:51 +0000 Bradley Treeby 6623@http://www.k-wave.org/forum/ <p>Not out of the box. They are calculated in the code as part of the particle velocity update equation, although this calculation also includes a grid shift. I'd suggest two options:</p> <p>(1) If you don't want to hack k-Wave and it's feasible to save all the data, record the pressure over the whole grid, then calculate the spatial gradient at each time step after the simulation using <code>gradientSpect</code>.</p> <p>(2) If you're happy to hack k-Wave, just add a new option inside <code>/private/kspaceFirstOrder_extractSensorData.m</code>. First add a spectral gradient calculation of the pressure (without the grid shift), and then sample at the sensor points using sensor_mask_index.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/easiest-fastest-way-to-obtain-spatial-derivatives-of-pressure#post-6604 Wed, 24 Oct 2018 18:44:58 +0000 NikiKeyz 6604@http://www.k-wave.org/forum/ <p>Is there a way to record dp/dx and dp/dy? As I understand they are calculated each step anyway.<br /> For now I use 2 additional sensors to calculate spatial derivatives.<br /> Thanks! </p>